/*
 * JBoss, Home of Professional Open Source
 * Copyright 2011, Red Hat, Inc. and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.mobicents.protocols.ss7.map.primitives;

import java.io.IOException;

import org.mobicents.protocols.asn.AsnException;
import org.mobicents.protocols.asn.AsnInputStream;
import org.mobicents.protocols.asn.AsnOutputStream;
import org.mobicents.protocols.asn.Tag;
import org.mobicents.protocols.ss7.map.api.MAPException;
import org.mobicents.protocols.ss7.map.api.MAPParsingComponentException;
import org.mobicents.protocols.ss7.map.api.MAPParsingComponentExceptionReason;
import org.mobicents.protocols.ss7.map.api.primitives.IMSI;
import org.mobicents.protocols.ss7.map.api.primitives.ISDNAddressString;
import org.mobicents.protocols.ss7.map.api.primitives.SubscriberIdentity;

/**
 * @author amit bhayani
 * 
 */
public class SubscriberIdentityImpl implements SubscriberIdentity, MAPAsnPrimitive {
	private static final int _TAG_IMSI = 0;
	private static final int _TAG_MSISDN = 1;

	private IMSI imsi = null;
	private ISDNAddressString msisdn = null;

	/**
	 * 
	 */
	public SubscriberIdentityImpl() {
		super();
	}

	/**
	 * @param imsi
	 */
	public SubscriberIdentityImpl(IMSI imsi) {
		super();
		this.imsi = imsi;
		this.msisdn = null;
	}

	/**
	 * @param msisdn
	 */
	public SubscriberIdentityImpl(ISDNAddressString msisdn) {
		super();
		this.msisdn = msisdn;
		this.imsi = null;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.mobicents.protocols.ss7.map.api.service.lsm.SubscriberIdentity#getIMSI
	 * ()
	 */
	@Override
	public IMSI getIMSI() {
		return this.imsi;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.mobicents.protocols.ss7.map.api.service.lsm.SubscriberIdentity#getMSISDN
	 * ()
	 */
	@Override
	public ISDNAddressString getMSISDN() {
		return this.msisdn;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.mobicents.protocols.ss7.map.api.primitives.MAPAsnPrimitive#getTag()
	 */
	@Override
	public int getTag() throws MAPException {
		if (this.imsi != null) {
			return _TAG_IMSI;
		} else {
			return _TAG_MSISDN;
		}
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.mobicents.protocols.ss7.map.api.primitives.MAPAsnPrimitive#getTagClass
	 * ()
	 */
	@Override
	public int getTagClass() {
		return Tag.CLASS_CONTEXT_SPECIFIC;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.mobicents.protocols.ss7.map.api.primitives.MAPAsnPrimitive#getIsPrimitive
	 * ()
	 */
	@Override
	public boolean getIsPrimitive() {
		return true;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.mobicents.protocols.ss7.map.api.primitives.MAPAsnPrimitive#decodeAll
	 * (org.mobicents.protocols.asn.AsnInputStream)
	 */
	@Override
	public void decodeAll(AsnInputStream ansIS) throws MAPParsingComponentException {
		try {
			int length = ansIS.readLength();
			this._decode(ansIS, length);
		} catch (IOException e) {
			throw new MAPParsingComponentException("IOException when decoding SubscriberIdentity: ", e, MAPParsingComponentExceptionReason.MistypedParameter);
		} catch (AsnException e) {
			throw new MAPParsingComponentException("AsnException when decoding SubscriberIdentity: ", e, MAPParsingComponentExceptionReason.MistypedParameter);
		}
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.mobicents.protocols.ss7.map.api.primitives.MAPAsnPrimitive#decodeData
	 * (org.mobicents.protocols.asn.AsnInputStream, int)
	 */
	@Override
	public void decodeData(AsnInputStream ansIS, int length) throws MAPParsingComponentException {
		try {
			this._decode(ansIS, length);
		} catch (IOException e) {
			throw new MAPParsingComponentException("IOException when decoding SM_RP_DA: " + e.getMessage(), e,
					MAPParsingComponentExceptionReason.MistypedParameter);
		} catch (AsnException e) {
			throw new MAPParsingComponentException("AsnException when decoding SM_RP_DA: " + e.getMessage(), e,
					MAPParsingComponentExceptionReason.MistypedParameter);
		}
	}

	private void _decode(AsnInputStream asnIS, int length) throws MAPParsingComponentException, IOException, AsnException {

		if (asnIS.getTagClass() != Tag.CLASS_CONTEXT_SPECIFIC || !asnIS.isTagPrimitive())
			throw new MAPParsingComponentException("Error while decoding SubscriberIdentity: bad tag class or is not primitive: TagClass="
					+ asnIS.getTagClass(), MAPParsingComponentExceptionReason.MistypedParameter);

		switch (asnIS.getTag()) {
		case _TAG_IMSI:
			this.imsi = new IMSIImpl();
			((IMSIImpl)this.imsi).decodeData(asnIS, length);
			break;
		case _TAG_MSISDN:
			this.msisdn = new ISDNAddressStringImpl();
			((ISDNAddressStringImpl)this.msisdn).decodeData(asnIS, length);
			break;
		default:
			throw new MAPParsingComponentException(
					"Error while decoding SubscriberIdentity: Expexted imsi [0] IMSI or msisdn [1] ISDN-AddressString, but found " + asnIS.getTag(),
					MAPParsingComponentExceptionReason.MistypedParameter);
		}
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.mobicents.protocols.ss7.map.api.primitives.MAPAsnPrimitive#encodeAll
	 * (org.mobicents.protocols.asn.AsnOutputStream)
	 */
	@Override
	public void encodeAll(AsnOutputStream asnOs) throws MAPException {
		this.encodeAll(asnOs, Tag.CLASS_CONTEXT_SPECIFIC, this.getTag());
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.mobicents.protocols.ss7.map.api.primitives.MAPAsnPrimitive#encodeAll
	 * (org.mobicents.protocols.asn.AsnOutputStream, int, int)
	 */
	@Override
	public void encodeAll(AsnOutputStream asnOs, int tagClass, int tag) throws MAPException {
		try {
			asnOs.writeTag(tagClass, true, tag);
			int pos = asnOs.StartContentDefiniteLength();
			this.encodeData(asnOs);
			asnOs.FinalizeContent(pos);
		} catch (AsnException e) {
			throw new MAPException("AsnException when encoding AdditionalNumber: " + e.getMessage(), e);
		}
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.mobicents.protocols.ss7.map.api.primitives.MAPAsnPrimitive#encodeData
	 * (org.mobicents.protocols.asn.AsnOutputStream)
	 */
	@Override
	public void encodeData(AsnOutputStream asnOs) throws MAPException {
		if (this.imsi != null) {
			((IMSIImpl)this.imsi).encodeData(asnOs);
		} else {
			((ISDNAddressStringImpl)this.msisdn).encodeData(asnOs);
		}
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((imsi == null) ? 0 : imsi.hashCode());
		result = prime * result + ((msisdn == null) ? 0 : msisdn.hashCode());
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		SubscriberIdentityImpl other = (SubscriberIdentityImpl) obj;
		if (imsi == null) {
			if (other.imsi != null)
				return false;
		} else if (!imsi.equals(other.imsi))
			return false;
		if (msisdn == null) {
			if (other.msisdn != null)
				return false;
		} else if (!msisdn.equals(other.msisdn))
			return false;
		return true;
	}

}
